Of the nine disjunctive pronouns, I found that eux (masculine they/them,#2) and soi (not on this test) give me problems.

Disjunctive pronouns (also known as tonic or stressed pronouns) refer to people whose names have already been mentioned or whose identity is obvious from context. They are used in a variety of situations in French, most often in short answers without verbs, for emphasis, or for contrast with subject pronouns.